Sewing-machine



(No Model.) 3 Sheets-fsheet l.

C. PRIEDERICH.

SEWING MACHINE.

No, 545,882.v VPazented Sept. 10,1895.

No Mom.) 3 sheets-sheen 2.

C. FRIEDERICH.

SEWING MACHINE.

No. 545,882. PafentedSept. 10, 1895.

(rio-Modem" e 3 sheets-sneeze. Y C FR-IEDERIGH.

SEWING MACHINE.

No. 545,882. Patented Sept. 10, 1895.

CHRISTIAN FRIEDERICH, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, lOFINEV JERSEY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 545,882, dated September 10, 1895.

Appiicaion ned me 27,1894. serai No. 515,879. or@ model.)

To all whom it may concern.-

Be it known that I, CHRISTIAN FRIEDERIGH, a citizen ofthe United States, residing at Eliza` beth, in the county of Union and State of New Jersey, have invented certainnew and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein tothe accompanying drawings.

In that class of sewing-machines in which an irregular feeding mechanism capable of moving goods backward as well as forward is employed in connection with the mechanism for moving the needle-bar laterally for the purpose of performing fancy stitching and in which the lateral movements of the needlebar are controlled by a pattern-cam having an intermittent rotating movement imparted thereto from the continuously-rotating driving-shaft more or less difficulty has been eX- perienced with the use of an ordinary pawland-ratchet mechanism for rotating the said pattern-cam by reason of the fact that where the cam is used in connection with a feeding mechanism for making a particular pattern an accidental backward turning of the driving-shaft by the operator or an accidental overthrowing of the pawl-and-ratchet mechanism for operating the pattern-cam will place the pattern-cam out of proper timing with the feeding mechanism, and thus render the machine inoperative for making the particular fancy stitch desired.

My invention has for its object to obviate the difficulty referred to, and this object is et'- fected by the use of what may be termed a positive ratchet mechanism, whereby a toothed wheel, to which the pattern-cam is attached and by which it is intermittingly rotated, is at all times held positively either by its operating-dog or by a holding-dog which is caused to engage the teeth of the said Wheel when the teeth of the operating-dog are released therefrom. The operating-dog and the teeth of the intermittingly-rotated wheel are of suchconstruction that if the direction of rotation of the driving-shaft should be accidentally reversed the movements of the toothed wheel and pattern-cam will also be reversed, and thus it will be impossible to get a patterncam which has once been properly set relative to the feeding mechanism and other parts of the machine out of timing.

' In the accompanying drawings, Figure lis a side view, partly in section, of a fancy-stitch sewingmachine embodying my invention. Eig. 2 is a bottom view of the same. Fig. 5 is a partial fr'ont view of the same. Fig. 4 is a partial longitudinal section through the arm,

showing the mechanism inclosed therein in side elevation. Figs. 5 and 6 are sectional Views on line 5 6, Fig. ll, the parts being in slightly-diiferent positions in the two figures. Fig. 7 is a detail view of the swinging sector and the dog carried thereby.

A denotes the bed-plateand B the bracketarm of a well-known type of Singer sewingmachine. Journaled in the upper part of the bracket-arm is the driving-shaft C, provided at its rear end with the fly-wheel and pulley c and at its forward end with a crank-disk c', connected by a link d with the block d', attached to the needle-bar D, said needle-bar having its vertical bearing in alaterally-movable frame D. Secured to the driving-shaft C is a cam-cylinder B, provided with camgrooves b and b. Mounted on a stud C', screwed into a web b2 in the bracket-arm B, is a toothed wheelD2, to which is attached a pattern-wheel D3, having a pattern cam-groove d2, which is entered by a pin or roller-stud e on the lever E, pivoted at its lower end at e in a suitable bearing in bracket-arm B and provided in its front face with agroove e2, in which is adjustably secured a pin f, connected by a pitman F to an arm d3 on the pivoted needle-bar-carrying frame D', Yso that vibrating movements of the said lever Will impart lateral movements to the needle bar frame and the needle-bar carried thereby. Pivoted on the hub Z4 of the toothed wheel D2 is a vibrating lever or sector G, which carries the operating-dog G', having at one end a rectangular tooth g for engagement with the rectangular teeth of the wheel D2 and having atY its other end a pin g', which enters the camgroove h in the cam-cylinder B', said dog being pivoted at g5 to the said vibratinglever or sector G and the latter being connected by a link h with a lever H, having a pin h', entering the cam-groove b to impart vibrating movements to the said lever or sector G, and

IOO

thus carry the Said dog G back and forth to intermittingly rotate the toothed wheel D2, the vibrating movements of the said dog on its pivot (imparted thereto by the grooved cam b) causing the tooth g to be engaged with and disengaged from the teeth of the said wheel at proper intervals.

I is aholding-dog pivoted att' to the bracketarm B andprovided at one end with a rectangular tooth t" for engagement with the teeth of the toothed wheel D2 and having at its opposite end a slot ft2, entered by a pin g8 on the operating-dog G', so that the said dog G as it is vibrated by the cam b will reversely operate the holding-dog, and thus as the tooth of the operating-dog is lifted from the teeth of the wheel D2 the tooth of the holdingdog will be engaged with the teeth of said wheel, and vice versa. It will thus be seen that a tooth of either the holding-dog G or the operatingdog I will always be in engagement with the teeth of the said wheel, and the latter will therefore always be positively held. The rectangular shape of the teeth of the wheel D2 and of the tooth gof the operating-dog Ginsures a positive hold by the tooth of the said operating-dog upon the teeth of the said wheel at all times, and if the shaft C beturned backward the operating-dog will therefore merely be reversed in its movements and will rotate the wheel D2 backward, thus always keeping the pattern cam-wheel D3, which is attached to said wheel D2, in proper timing with the other parts of the machine.

J is a vertical shaft placed within the vertical part of the bracket-arm B and provided at its upper end with a beveled gear-wheelj, meshing with a similar beveled gear-wheel e4 on the driving-shaft C, the said vertical shaft J having at its lower end a crank j', connected by a pitman J with the shuttle-operating shaft K at the forward end of the machine in the usual manner with this style of machines. The shaft J is provided above the crank j with a pinion 7c, which is connected by a train of gearing with the cam-wheel L, having a suitable cam-groove entered by a pin m on the bell-crank lever M, which latter serves to impart vibrating movements to the feedinglever N, longitudinal movements being imparted to said feeding-lever by the usualcam on the shaft J for the purpose of raising and lowering the feed bar O. The vibrating movements ofv the said feeding-lever N to move the feed-bar back and forth horizontally are controlled by the cam-wheel L, which may be provided with a cam-groove'of any desired pattern, according to the fancy stitch which it may be desired to prod uce. This particular feeding mechanism is constructed to move the work backward at times, as well as forward, and is the same as heretofore employed in the fancy-stitch Singer machine, and is merely herein shown and described for the purpose of a full understanding of my invention, the essential feature of which is in the positively-rotated Wheel D2, which controls the pattern-cam for moving the needle-bar laterally and which is capable of being moved either backward or forward, according to the direction of rotation of the driving-shaft, so that it will always be kept in time with the feeding mechanism controlled by the camwheel N.

From the foregoing it willc be understood that when the machine is in operation intermittingly-rotating movements will be imparted to the toothed wheel D2 by the operatingdog G', said wheel being positively held either by the tooth g of the said dog or by the tooth t" of the holding-dog I, the pin-and-slot connection of the said dogs G and I causing the tooth of the holding-dog to be engaged with the teeth of the said wheel when the tooth of said holding-dog G is released therefrom, and Vice versa. The swinging movements of the lever or sector G, imparted thereto from the cam-groove b through the lever Hand link h, carries the operating-dog G bodily back and forth, and therefore imparts an intermittent rotary movement to the said wheel, the vibrating movements of the said dog G', imparted thereto from the grooved cam b', causing the tooth of the said dog to be alternately engaged with and disengaged from the teeth of the said wheel. Owing to the fact that the toothed wheel D2 will always be rotated either backward or forward, according to the direction of rotation of the driving-shaft, and also owing to the fact that said toothed wheel is always positively held by its operating-dog G or by the holding-dog I it will be impossible for the cam-wheel operated by the said toothed wheel to get out of timing with the feeding mechanism or any other parts of the machine either by overthrowing movements of the said toothed wheel or by accidental reverse movements of the driving-shaft.

Having thus described my invention, I claim and desire to secure by Letters Patentl. In a sewing machine, the combination with a feeding mechanism, of a needle bar, a swinging frame in which said needle bar has its vertical movements,a cam wheel connected to said needle bar to impart lateral movements thereto, a toothed wheel by which said cam wheel is operated, a swinging sector or lever, a pivoted operating dog carried thereby and having a tooth for engagement with the teeth of the said wheel, two rotating cams one of which serves to vibrate said operating dog on its pivot to cause its tooth to be engaged with and disengaged from the teeth of said wheel and the other of which is connected with., said swinging sector to move the latter and the operating dog carried thereby back and forth to intermittingly rotate said wheel, acontinuously rotating shaft on which said cams are mounted, a holding dog having a tooth for engagement with the teeth of said wheel, and means for operating said holding dog so that its tooth will be in engagement with the teeth of the wheel when the tooth of IIO .the operating dog is disengaged therefrom,

and vice Versa.

2. The combination with the shaft C, of the needle bar operatively connected with the forward end of said shaft to be reoiprooated vertically, a Swingin g frame in which said needie-bar has its vertical bearings, the toothed wheel D2, the pattern cam-Wheel D3 operated by said toothed Wheel and connected with said needle-bar frame to move the latter horizontally, the @am cylinder B carried by said shaft C and having the grooved cams b and b', the swinging sector or lever G, the lever H 

